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matterircd vs BitlBee: catalog facts
matterircd	BitlBee
Free Free and open source under the MIT license.	Free Free and open source; public servers are also available.
Windows, Linux, Self-hosted, Command line	Linux, Self-hosted
Use Mattermost or Slack from any IRC client Docker and systemd files included	Use XMPP and other networks from any IRC client Plugins for Discord, Mastodon, Steam and more
Requires an existing Mattermost or Slack account Some platform features do not map cleanly to IRC	Last stable release dates from 2019 Requires comfort with IRC and a bot-driven setup
Downloadable app, Self-hosted	Downloadable app, Self-hosted
Open source	Open source
License: MIT	License: GPL-2.0
Account needed	No account needed
Needs internet	Needs internet
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.